Detachable rim for pneumatic tires.



P.. ETRAGHI. DBTACHABLB RIM FOR PNEUMATIG TIRES. APPLOATION NLE@00T,18.19o.

www. Dec. 28, w09.

PIETRO PIETRACCHI.)(H5` VARESE, ITALY.

DETACHABLE RIIVFEOR PNEUMATIC TIRES.

Specification of Letters Patent. ,l iutgnted Der', 28. 1909,

Application filed October 18. 1906. Serial No. 339.424,

To (/ZZ 'whom it may concern:

lle 1l' known that l, lnaruo lrz'rnaccx-n, a

subject ot' the King of italy. residing in Varese. italy, have inventedcertain new and a specification.

useful lml'n'ovements in Detachable Rims for Pneumatic Tires, oi" whichthe following is ln order to minimize the loss of time eng suingl frompuuctures and similar accidents on uiolor car wheels' tilted withpneumatic lires. the following device is sometimes rcsorted to: The rimcarrying the pu-'i-uirmtic tire is so arranged as to allow ot its beingeasily removed from and secured to thecenlral part of the wheel. with anintiated pneumatic tire read)v toi; Iuse carried ou the par all alongthe travel land may be-iu a tewruiinutes titled in the place of the rim.the tire oi' which has' been damaged during the run.

"the present invention concerns detachablerims of the description abovereferred to.

According to the sa me the detachable rims are not made in one piece asusually, but are divided in two or more parts along a plane or planesperpendicular to the axis of the wheel. Said parts are kept together byjoining pieces of any convenient description, but may be removed fromeach other to a. certain extent after loosening` said joining pieces, inwhich case theyare still connected I .together by the outer cover of thepneumatic tires, the edges of which are properly secured to the outerface of the rim.

The accompanying drawings show by way of example how the presentinvention may be carried into practice.

Figure l shows a section along the axis of a complete wheel embodyingthe invention;- Fig. 2 is a detail of the outer part of the wheelshowing a somewhat different kind of connection between the removablerim and the wheel itself; Fig. 3 shows the removable rim divided intoits two parts which are taken apart from'each other; Fig. l shows, byway of example, how the said two parts may be connected together.

a (Figs. l and 2) is one ofthe wooden fellies or rim segments,surrounded by a tight. metal ring b; c and (l are the two parts of whichthe removable rim consists. They are provided with qsuitably formedrecesses e intended to receive the edges of the outer cover, becausethey according to the present spare rim fitted i inventiontl arefastened to the removable rim. It iuay'be understood that the. outershape of the rim may vary according to the nature et the tire employed.y

The comiectionbetween the parts a., c may be obtained by any convenientmeans. for instanceby means ot' a hook bolt f prorided with an ordinarynut (Fig. l upper part) or with a thumb vnut (Fig. l lower part) AAccording to the modification shown 1n Fig. 2. the hook /L is looselymounted upon the holt stem, which .is provided with u nut shaped head g.an elastic was-lier i and an ordinary nut m, but instead ofthe elastic'washer any otherlocking arrangement may be employed.

The two parts of the removable; rim shown in Fig. 3 may be tightlypressed against each otlrer..someti1nes with the. insertion of a packingstuft n. between theadjacent 'edgbs, as shown in Fig. 2 toprotct the airtube from rain anddust, but asmall play may be left in some casesbetween .the said parts. l f

According to Fig. 4, which is given by way of.- example only, theconnection befween said parts is obtained byI means of iolts's, locatedwithin the recesses 'v and turning on the hin es e with which one ofsaid parts is provi ed.

The present invention removes the ditiiculty usually experien' dinmountin the outer cover of the pne v atie tire by a 10W ing one to fixthe two parts of the rim on the corresponding edges of the cover,vinstead of forcing the cover into the rim. Secondly this arrangementallows of the air tube being changed without the necessity of changino'the outer cover as long as the same is sti l available. To that effect,when the removable rim has been dismounted, the bolt-s s are unlocked,the two parts c and d of said rim are brouglitapart so as to allow ofthe damaged air tube bein taken out. A new tube. is thereafter'inserteinto the outer cover through the interval between the adjacent edges ofo and d. While the air tube. is being changed, the two parts c and d arekept together by the outer cover, but as soon as the replacement hastaken place, the boltsv s are turned again upon Itheir hinges and lockedbefore the inflation of the air tube is proceeded with.

As the air tube Gets damaged much more frequently than the outer cover,the ad- Vvantage ofv being enabled to change the air 'brought along anyspare rim ready for use,

he can lchange a punctnred tube much quicker and easier than by theordinary system, while, 1t he carries one or two extra l rims ready foruse and besides some spare inner tubes, he is practicall out of alldanger of'a break down, as, a ter having used, if' necessary, his sparerims, he can, in ease of new punctures, easily replace the inner tube.Moreover he can eifect the change of the tube-while the car is runningand so prepare a new spare rim with infiated tube ready. for use.

Having now described my invention and hoW the same is to bc carried out,what I desire to claim is: l. A detachable rim for pneumatic tires,divided in its medial portion along a plane perpendicular to its axis,each part provided wit i meansto hold the outer tire-tube, the

inner face of the two-part rim being beveled VYat an inclination to theaxis, an annular Wedge member arranged to fit between the .felly.v

2. 'A detachable rim for pneumatic. tires, 1

beve ed interior face of the rim and the cylindrical outer face of thefelly, and means vbearing from opposite directions against the thickered e of the rim and the wedge inember tofloc the same together and tothe divided in Iits medial portion along a plane perpendicular to itsaxis, the inner face of the two-part rim recessed transversely atintervals, and tie-bolts arranged in the lrecesses to bind the two.parts of the rim together independent of the wheel.

3. A detachable rim for pneumatic tires, divided in its medial portionalong a plane perpendicular to its axis, the inner face of the two-partrim recessed transversely at intervals, and tie-bolts provided with a.head at enc end and hinged 'at the other end to one of the rirn members,and arranged to lie in the recesses to clamp the two parts of the rimdtogether between the hinged end and the hea 4. A detachable rim'forpneumatic tires', divided in its medial portion along a planeperpendicular to its axiseaeh partprovided with means to hold the outertire-tube, the inner face of the'two-part rim beveled at an inclinationto the axis and\1'eeessed transversely at intervals, tie bolts providedwith :r head at one endend hinged at the other to one of the riinmembers and arranged to lie 'ni the recesses to clamp the two parts. ofthe rim together between ,the hinged ends and the heads` an annular Wede member arranged to tit between tligfbeye ed` inner face of the rim andthe outefce of the felly, and bolts arranged in the folly andoverlapping at their extremities the thicker edge the whole rmlytogether.

The foregoin s ecification signedthis fourth day of ctdber 1906, at theAmeri ican consulate in Milan, Italy.

In presence of these witnesses:

B. CARLO SALVATTI, H. B. GURNY.

of the rim and of the wedge member to bind

